Physics: need help from experts!

programming
1

I’m making a sidescroller shooter. Everything works fine but I want to implement some nice physics like physical boxes. I want to have physical boxes if you shoot at them etc… Now, ive found something that could be usefull: http://flash-creations.com/notes/astb_bounceCollide.php
The only problem: I want the shapes to collide with eachother and resolve their collision, and I want them to collide with my platform (the ground that I drawed)

Suggestions?

Thanks for reading!

2

what exactly ae you after?\\\

3

I think hes saying he wants a box to explode into little peices that go flying around bouncing off eachother in realistic ways until they come to rest on the ground